import turtle //导入模块
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import time
import os
def draw_square(org_x, org_y, x, y): //定义红旗绘制函数
turtle.setpos(org_x, org_y) //定义画笔初始位置
turtle.color('red', 'red') //颜色
turtle.begin_fill() //开始绘制
turtle.fd(x) //绘制偏转方向和角度
turtle.lt(90)
turtle.fd(y)
turtle.lt(90)
turtle.fd(x)
turtle.lt(90)
turtle.fd(y)
turtle.end_fill() //绘制结束
def draw_star(center_x, center_y, radius): //定义星星绘制函数
print(center_x, center_y) //显示位置
turtle.pencolor('black') //画笔轨迹颜色
turtle.setpos(center_x, center_y) //中心点位置
pt1 = turtle.pos() //偏转角度计算
turtle.circle(-radius, 360 / 5)
pt2 = turtle.pos()
turtle.circle(-radius, 360 / 5)
pt3 = turtle.pos()
turtle.circle(-radius, 360 / 5)
pt4 = turtle.pos()
turtle.circle(-radius, 360 / 5)
pt5 = turtle.pos()
turtle.color('yellow', 'yellow') //星星颜色
turtle.begin_fill() //开是绘制
turtle.goto(pt3)
turtle.goto(pt1)
turtle.goto(pt4)
turtle.goto(pt2)
turtle.goto(pt5)
turtle.end_fill() //绘制结束
print(turtle.pos())
turtle.pu() //隐藏画笔轨迹
draw_square(-320, -260, 660, 440) //绘制红旗
star_part_x = -320 //自定义星星大小等属性
star_part_y = -260 + 440
star_part_s = 660 / 30
center_x, center_y = star_part_x + star_part_s * 5, star_part_y - star_part_s * 5 //计算星星中心点位置
turtle.setpos(center_x, center_y)
turtle.lt(90)
draw_star(star_part_x + star_part_s * 5, star_part_y - star_part_s * 2, star_part_s * 3) //绘制星星
turtle.goto(star_part_x + star_part_s * 10, star_part_y - star_part_s * 2) //同上
turtle.lt(round(turtle.towards(center_x, center_y)) - turtle.heading())
turtle.fd(star_part_s)
turtle.rt(90)
draw_star(turtle.xcor(), turtle.ycor(), star_part_s)
turtle.goto(star_part_x + star_part_s * 12, star_part_y - star_part_s * 4)
turtle.lt(round(turtle.towards(center_x, center_y)) - turtle.heading())
turtle.fd(star_part_s)
turtle.rt(90)
draw_star(turtle.xcor(), turtle.ycor(), star_part_s)
turtle.goto(star_part_x + star_part_s * 12, star_part_y - star_part_s * 7)
turtle.lt(round(turtle.towards(center_x, center_y)) - turtle.heading())
turtle.fd(star_part_s)
turtle.rt(90)
draw_star(turtle.xcor(), turtle.ycor(), star_part_s)
turtle.goto(star_part_x + star_part_s * 10, star_part_y - star_part_s * 9)
turtle.lt(round(turtle.towards(center_x, center_y)) - turtle.heading())
turtle.fd(star_part_s)
turtle.rt(90)
draw_star(turtle.xcor(), turtle.ycor(), star_part_s)
turtle.ht()
time.sleep(5) //设置挂起时间
os._exit(1)
# python6.6
import turtle
def test():
# 加纳共和国国旗呈长方形，长与宽之比为3∶2。
# 自上而下由红、黄、绿三个平行相等的横长方形组成，黄色部分中间是一颗黑色五角星。
flag_h = 300
flag_w = 450
star_h = flag_h/3
turtle.pensize(2)
turtle.speed(5)
turtle.hideturtle()
def draw_rectangle(color):
turtle.pencolor(color)
turtle.fillcolor(color)
turtle.pendown()
turtle.begin_fill()
turtle.forward(flag_w)
turtle.right(90)
turtle.forward(star_h)
turtle.right(90)
turtle.forward(flag_w)
turtle.right(90)
turtle.forward(star_h)
turtle.end_fill()
turtle.penup()
turtle.back(star_h)
turtle.right(90)
turtle.penup()
turtle.goto(-flag_w / 2, flag_h / 2)
draw_rectangle("red")
draw_rectangle("yellow")
draw_rectangle("green")
# 五角星
turtle.penup()
turtle.goto(0, star_h/2)
turtle.pencolor("black")
turtle.fillcolor("black")
turtle.right(90-18)
turtle.pendown()
turtle.begin_fill()
for i in range(5):
turtle.forward(star_h)
turtle.right(180-36)
turtle.end_fill()
turtle.done()
if __name__ == "__main__":
test()
把整个国旗换成直角坐标系。
在Python中绘制标准国旗并不简单，我们采用的方法在数学上称为解析法。把整个国旗换成直角坐标系，中心坐标为（0，0）。每个小格边长20，则国旗左上角坐标为(-300，200)、国旗长600，高400。Turtle是小海龟绘图库，Math是数学库，要用到里面的三角函数和反三角函数，以及圆周率pi值。
Python是一种解释型、面向对象、动态数据类型的高级程序设计语言。 Python于1989年底发明，第一个公开发行版发行于1991年。
参考下五星红旗
code#!/usr/bin/env python
# -*- coding: utf-8 –*-
''' 对于turtle类的一些封装方法，包括画正多边形，正多角形和五星红旗。'''
__author__ = 'Hu Wenchao'
import turtle
import math
def draw_polygon(aTurtle, size=50, n=3):
''' 绘制正多边形
args:
aTurtle: turtle对象实例
size: int类型，正多边形的边长
n: int类型，是几边形
'''
for i in xrange(n):
aTurtle.forward(size)
aTurtle.left(360.0/n)
def draw_n_angle(aTurtle, size=50, num=5, color=None):
''' 绘制正n角形，默认为黄色
args:
aTurtle: turtle对象实例
size: int类型，正多角形的边长
n: int类型，是几角形
color: str， 图形颜色，默认不填色
'''
if color:
aTurtle.begin_fill()
aTurtle.fillcolor(color)
for i in xrange(num):
aTurtle.forward(size)
aTurtle.left(360.0/num)
aTurtle.forward(size)
aTurtle.right(2*360.0/num)
if color:
aTurtle.end_fill()
def draw_5_angle(aTurtle=None, start_pos=(0,0), end_pos=(0,10), radius=100, color=None):
''' 根据起始位置、结束位置和外接圆半径画五角星
args:
aTurtle: turtle对象实例
start_pos: int的二元tuple，要画的五角星的外接圆圆心
end_pos: int的二元tuple，圆心指向的位置坐标点
radius: 五角星外接圆半径
color: str， 图形颜色，默认不填色
'''
aTurtle = aTurtle or turtle.Turtle()
size = radius * math.sin(math.pi/5)/math.sin(math.pi*2/5)
aTurtle.left(math.degrees(math.atan2(end_pos[1]-start_pos[1], end_pos[0]-start_pos[0])))
aTurtle.penup()
aTurtle.goto(start_pos)
aTurtle.fd(radius)
aTurtle.pendown()
aTurtle.right(math.degrees(math.pi*9/10))
draw_n_angle(aTurtle, size, 5, color)
def draw_5_star_flag(times=20.0):
''' 绘制五星红旗
args:
times: 五星红旗的规格为30*20， times为倍数，默认大小为10倍， 即300*200
'''
width, height = 30*times, 20*times
# 初始化屏幕和海龟
window = turtle.Screen()
aTurtle = turtle.Turtle()
aTurtle.hideturtle()
aTurtle.speed(10)
# 画红旗
aTurtle.penup()
aTurtle.goto(-width/2, height/2)
aTurtle.pendown()
aTurtle.begin_fill()
aTurtle.fillcolor('red')
aTurtle.fd(width)
aTurtle.right(90)
aTurtle.fd(height)
aTurtle.right(90)
aTurtle.fd(width)
aTurtle.right(90)
aTurtle.fd(height)
aTurtle.right(90)
aTurtle.end_fill()
# 画大星星
draw_5_angle(aTurtle, start_pos=(-10*times, 5*times), end_pos=(-10*times, 8*times), radius=3*times, color='yellow')
# 画四个小星星
stars_start_pos = [(-5, 8), (-3, 6), (-3, 3), (-5, 1)]
for pos in stars_start_pos:
draw_5_angle(aTurtle, start_pos=(pos[0]*times, pos[1]*times), end_pos=(-10*times, 5*times), radius=1*times, color='yellow')
# 点击关闭窗口
window.exitonclick()
if __name__ == '__main__':
draw_5_star_flag()
/code
